Magnetic particle carrying device, and developing unit, process cartridge, and image forming apparatus using the same, and surface treatment method of the same
US7899374B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Sep 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0863
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic particle carrying device includes a magnetic field generator and a hollow cylindrical structure. The magnetic field generator generates a magnetic field. The hollow cylindrical structure encases the magnetic field generator and attracts magnetic particles on an external surface of the hollow structure using the magnetic field. The external surface of the hollow cylindrical structure is provided with a plurality of elliptical depressions. The depressions include first type depressions and second type depressions. A long axis of a first type of elliptical depression is substantially extending in an axial direction of the hollow cylindrical structure, and a long axis of a second type of elliptical depression is substantially extending in a circumferential direction of the hollow cylindrical structure. The external surface of the hollow cylindrical structure has more elliptical depressions of the second type than elliptical depressions of the first type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.